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Restructuring Charges (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Restructuring Cost and Reserve    
Restructuring charges $ 2,206,000 $ 0
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2012 906,000  
Restructuring charges 2,206,000 0
Payments (1,566,000)  
Non-cash charge (653,000)  
Balance at March 31, 2013 893,000  
Employee Severance
    
Restructuring Cost and Reserve    
Restructuring charges 246,000  
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2012 906,000  
Restructuring charges 246,000  
Payments (623,000)  
Non-cash charge 0  
Balance at March 31, 2013 529,000  
Facilities
    
Restructuring Cost and Reserve    
Restructuring charges 1,960,000  
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2012 0  
Restructuring charges 1,960,000  
Payments (943,000)  
Non-cash charge (653,000) [1]  
Balance at March 31, 2013 364,000  
Minimum
    
Restructuring Cost and Reserve    
Company estimate of the aggregate restructuring cost 6,000,000  
Maximum
    
Restructuring Cost and Reserve    
Company estimate of the aggregate restructuring cost $ 10,000,000  
[1] The non-cash charge of $653 thousand is related to the termination of the Company's financing obligation associated with abandoning a construction asset at one of its facilities.